Process for cooling furnaces by means of cooling chambers



J1me 1935- G. DC5RRENHAUS ET AL 2,006,266

PROCESS FOR COOLING FURNACES BY MEANS OF COOLING CHAMBERS Filed June 9, 1934 5 Sheets-Sheet 1 /7/ 6/7/0/SI Q. D'rr-en 116145 WE -Hiermm/4A W June 1935- O G. DCRRENHAUS ET AL 2,005,256

PROCESS FOR COOLING FURNACES BY MEANS OF COOLING CHAMBERS Filed June 9, 1934 3 Sheets-Sheet 2 a l if June 25, 1935. DbRRENHAUs ET AL 2,006,266

PROCESS FOR COOLING FURNACES BY MEANS OF COOLING CHAMBERS Filed June 9, 1934 3 Sheets-Sheet 3 Fig.4

In venl'ors Patented June 25, 1935 UNITED, STATES v PATE PROCESS FOR COOLING FURNACES BY MEANS OF COOLING CHAMBERS Gustav Diirrenhaus Ruhr, Germany, ass einigte Stahlwerke' A I dorf, Gcrmany and: Simon Walter, Mulheimignors to' the firm Verktiengesellschaft, Dussel- Application June 9, 1934, Serial N... 729,862

7 In Germany 8 Claims.

The present invention rel vice and arrangement for chambers in blast furnaces. 4

In the already known cooling chambers forthe cooling of blast furnaces closed in most cases, large deposit in the coolin constantly to be re ants.

ates to a process, de-,

quantities of sludge g chamber andthese have If the sludge is notremoved in time or q if the cooling should fail, the cooling chambers will crack. This will cause the water to flow into the blast furnace with the result that normal working may have to be interrupted. The present invention has the object of ensuring reliable cooling at all times and of reducing the consumption of water. According to the present invention a saving of about 70% of water can be attained in comparison with the cooling systems hitherto in use. 3

The present invention consists in that the cooling agent is sprayed against the cooling surfaces of an open cooling chamber in a fine spray. The atomizing of the cooling agent in the form of a spray results in the surfaces-of the cooling g chamber being wetted on all sides which gives a higher degree of efficiency of the cooling surfaces, which up to the present, with the usual flushing systems, were only cooling chamber filling. The atomizing of the o cooling agent is most advantageously effected by blowing in compressed air under low pressure (about 0.1-0.2 atm.) into the cooling stream, which is flowing into the cooling chamber-or by blowing compressed air through the surface level of the cooling agent filling in cooling chambers of already known systems. In both cases the compressed air not only ensures a very fine atomization of the cooling agent but results also in a particular support due to the fact that the compressed air, when expanding, absorbs heat.

As it is possible to work with very small quantitles of water and compressed air, comparatively simple devices will be sufficient. Only a small number of stop-cocks for water are required be- 5 cause there is no need to clean out the cooling chamber; this is due to thefact th can deposit in the cooling chamber because the compressed air would keep any sludge which might be present, suspended in the cooling agent.

No special stop-cocksare required for the compressed air conduits,,because it is possible to employ simple sealing plugs if it should be necessary to subdivide the compressed air pipings. For the purpose of carrying out the process, a

nozzle can be used for the discharge. of the cooling agent stream in the cooli which nozzle channels connected with the source of compressed air issue in such a, way that the jets of compressed air which emerge therefrom 0 atomize the cooling means and spray the same the cooling of cooling which chambersare moved by numerous attend ooled in ratio to the at no sludgev ng chamber into June 23, 1933 against the upper wall and the sidewalls of,

the cooling chamber. If the compressed air is to --be.blown through the surface level of=-the liquid in the cooling chamber, then, a compressed; air nozzle with channels arranged in a suitable direction is arranged under the surface of the liquid. The cooling agent can be led through a series of cooling chambers and can be used over and, over again, especially because the expansion of the compressed air produces a considerabledecrease in the temperature of the cooling. agent. The cooling chambers can therefore be connected by simple overflow pipes, in such a way. that the overflow water of an upper cooling chamber will flow into the chamber situated below it,: where; it will be used again for cooling purposes by atom? i zing and spraying it in a finely divided state against the upper wall and. the side walls of the cooling chamber. This process can becontinued until the C0017" ing water has reached the permissible tempera-i ture. As the spraying by means of compressed air cools the overflow water always afresh, it can be used for a large number of cooling chambers arranged one underneath the other. According to the present invention cracked cooling chambers can still be used in thatchambers are inserted into them which are cooled ac'' cording to the present invention and transmit, their low temperature to the cracked chambers.

The present invention has therefore a' num ber of advantages, namely: I

l. About 70% saving in'cooling means. 2. A smaller number of attendants are required. I 3. Safer working, because the cracking of cooling chambers is eliminated and there is no danger of water entering the furnace. 4. Less weight of the cooling chamber, due to a higher degree of efiiciency of the cooling. surfaces. c The power required for atomizing the air is very low. Witha pressure of, for example, 0.8 atm. wind pressure in a blower having a capacity of 1000 cbm. wind per minute, only about cbm. wind are required for,750 cooling chambers of a blast furnace of a capacity of 400 tons I iron per day, in order to produce the atomization, which is about 6% of the capacity. This additional output can be obtained if the usual number of revolutions of the machine is increased by a few revolutions. r

The new cooling process has been practically used for a considerable time at a furnace having a capacity of 400 tons per day None of the cooling chambers has been damaged thereinduring the whole working period. Furthermore, the furnace consumed only 2 cubic meters of; cooling water per minute in comparison with a 60 consumption of 7 cubic meters per minute in the already known cooling processes by means of a half of the number of attendants were required, namely a single person each time, compared with the formerly required two persons for attending the cooling process. In spite of using muddy river water no sludge has been deposited in the cooling chambers so that a removal of sludge was entirely superfluous and a continuous and uniform cooling of the whole shaft of the furnace and in con sequence thereof a regular working of the furnace without any troubles was obtained.

In the accompanying drawing the present invention'is more clearly described by means of examples. In the drawing -Fig. 1 is-asection through a cooling chamber and a water nozzle I I Fig. 2 is aside elevation of a part ofthe'furnace wall with the arrangement of the cooling devices "Fig. 3 is -across section according to line III-4110f Fig. 2 r r Fig. 4 is a section of a cooling chamber which isi-nserted in anoriginalcooling chamber which is damaged at-two places.

' bers.

In Fig. l a'cooling chamber I is shown-having anins'ertedwater inlet or; nozzle 2, at the. lower end of which compress'edair, coming from the pipe 3 is so guided through channels 4 against the emerging stream of water, that the latter is sprayed, i. e., atomized to a very highdegree- The surpluscooling water flows through the over-- flow 5 and can then be used again in the other cooling chambers of the furnace arranged belOW it. i

The said utilization 'lc etc. of the armour of the furnace and flows through. the pipe lines 8a, 8b, etc. ofs-ufficient I dimensions to the distributing troughs 9a,- 9b, 9c. From these troughs the cooling water flows i'hrough the pipe lines l0a, I0b, i0c etc. to the cooling? chambers Ha, lib, Ilc etc. of the two upper ranges, As is to be seen from Figure 2 the several tubes are supported upon the cooling chamber. For instance the tube 2 for feeding water .may be secured thereto and' thetube 3 for feeding air may be linked to the tube 2-. Instead of having the tubes suspended to the cooling: chamber it would, of course, also be possible to support them upon the housing of the furnace or upon the stagings around the furnace.- In these cooling chambers the water is atomized'by means of the air fed through the conduits l2 and sprayed against the surfaces of the cooling cham- The water flowing over the cooling chambers Ha, Hb, llc etc. passes through the pipes-- I3a, l3b, etc. to the cooling'chambers Ida,

N12,. I40 etc oftthe third and fourth range and so" on',.in which cooling chambers it is atomizfed'in the same'manner as before. When the cooling water has reached its highest admissible temperature, for'ex. after having been used in 10-15 rangesiof cooling chambers lying one below the other, it is carried off by-the collecting pipe line Il,.'and fresh cooling water is fed to the following rangesof cooling chambers by'the pipe IineIB' and the distributing troughs Ila, I Ib, I'Ic' 'etc.

The above described distributingarrangement is'shown in-section in Fig. 3;

of thesurpluswater will apparent from Fig. 2. The cooling water is" fedby the conduit 6 to the single segments Ia, "lb,

In Fig. 4 aspecial application of the invention is shown in that case where the original cooling chamber I8 is cracked for example at l9 and 20.

In this cooling chamber l8 another cooling chamber. 23 is then inserted which is filled with water and provided with an air inlet 2| by means of which air is blown through the surface 22 of the water and sprayed thereby against. the walls of the cooling chamber 23.

What we claim and desire to secure by Letters .Patent of the United States of America is:

sprayed in atomized form against the coolingsur faces of the cooling chamber by means of air under a pressure of about 0. l-;0.2'a tm.

3'. A process for cooling furnaces by means of cooling chambers in which a cooling stream is introduced into the chamber and a stream of air is caused-t0 act upon said cooling stream under a pressure of about 0.1-0.2 atm. so that the cool-' ing agent is atomized and sprayed against the coolingsurfaces' of the cooling chamber. 1

4. Aprocess for cooling furnaces by means of cooling chambers'in which a cooling stream is" introduced into the chamber and air under a pressure of about 0.1-0.2 atm. is blown in an up ward direction through the surace level of the cooling agent so that the cooling agent atomized and sprayed against the cooling surfaces of the cooling chamber.

5. A cooling chamber for cooling blast f'ur naces,provided with a nozzle for introducing" the coolingagent, in whichcompressed air channels are arranged to introduce jets of compressed air" which atomize and spray the cooling agent.

6.. A cooling chamber for cooling blast fur;

ne'ces, provided with a nozzle for compressed air which is arranged under the surface level of the cooling agent which is in the cooling'fch'amb'er,

the said nozzle being arranged to blow in air which sprays the cooling agent against the surfaces of the cooling chamber.

'7 Anarrangement forfcooling blast furnaces, -50

comprising a plurality of cooling chambers arranged in the wall of the furnace in several rows one below the other, supply pipes for thecool'i'ng agent, the said supply pipes being connected with the upper rows of the cooling chambers, connecting pipes between the upper and lower rows of cooling chambers: for leading the overflow cooling agent, and air supply pipes connected with the Cooling bers for supplying compressed air to the same.

8. An arrangement for cooling blast"furna'ces;

comprising a; plurality of cooling chambers arranged in the wallof the furnace in several'rows' one below the other in checked formation, supply pipesfor the cooling agent, the said supply pipes being connected with the two upper rows'of cooling chambers, connecting pipes between the upper andalowerrows of cooling chambers for leading theoverflow cooling agent, the cooling chambers of each row being connected with that of each second row belowit and air supply'pipes connected'with the cooling chambers for supplying" compressed air to the same.

GUSTAV DGRRENHAUS; SIMON WALTER. 

